Hoisting mechanism.



PATENTBD own, 1905.

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D. W. SMITH. HOISTING MECHANISM.

APPLICATION FILED JUNE 12 1905 We or @0112??? (a Sufi/1;

UNITED STATES PATENT OEETCE.

HARVESTER COMPANY, A CORPORATION OF NEW JERSEY.

HOlSTING MECHANISM.

Specificationof Letters Patent.

Patented Oct. 17, 1905.

Application filed June 12,1905. Serial No. 264.747.

T rtZZ whom it may concern:

Be it known that I, DANIEL W. SMITH, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Hoisting Mechanism, ofwhichjhe following is a specification, reference being had to theaccompanying drawings, forming a part thereof.

My invention relates to hoisting mechanism in general, and isparticularly designed for application to corn-shocking machines.

It consists in a drum adapted to receive the lifting-cable and having aratchet-toothed wheel or rim secured thereto and a lever mounted uponthe axis of the drum and adapted to vibrate thereon and havinggravity-pawls adapted to engage with the ratchet-teeth in a manner tocontrol the movement of the drum.

It further consists in an improved construction of the drum, thesupport, and pawls whereby the latter are automatically disengaged fromthe ratchet-teeth, and one of them may be caused to operate as a brakefor the purpose of controlling the movement of the drum in onedirection.

The objects of the invention are to provide a mechanism that will beboth strong and effective and one that will readily control the movementof the drum in raising or lowering the load. 1 attain these objects bythe mechanism illustrated in the accompanying drawings, in which Figure1 is a side elevation of a corn-shocking machine having my inventionforming a part thereof, and Figs. 2 and 3 are detached details of thehoisting mechanism. V

Similar reference-numerals refer to similar parts throughout the severalviews.

1 represents the frame of the machine, upon which is rotatably mounted amast 2, that is suitably supported in an upright position by means ofthe braces 3 and 4:, and 5 is the shockforming standard, which may besupported on the machine and connected with the mast in any of the usualways. Secured to the mast is a fixed bracket 6, and rotatably mounted onthe bracket is a winding-drum 7, provided ,with a ratchet-toothed rim 8.An operating-lever 9 is pivotally mounted upon the axis of the drum, anda gravity-pawl 10 is pivotally mounted thereon. A gravity-pawl 11 ispivotally mounted upon the mast 2 and adapted to engage with the toothedrim of the drum in a manner to normally prevent a backward rotation ofthe same. The pawl 10 is wider at its operative end than theratchettoothed rim, and 12 is an upwardly-projecting ear forming part ofthe bracket 6. The ear portion projects within the path of the operativeend of the pawl 10 when the lever 9 is nearing the downward limit of itsmovement and is provided with a cam-surface that contacts with the pawland disengages it from the ratchet-toothed rim. The lever 9 is providedwith an upturned toe portion 13, designed to contact with a widenedportion of the operative end of the pawl 11 in a manner to disengage itfrom the ratchet-toothed rim at approximately the same time as the pawl10 is disengaged. The pawl 11 is provided with a downwardly-hanging wing14, that lies adjacent the inner side of the toothed rim and is providedwith a laterally-projecting shoe portion 15, that is adapted to contactwith the inner surface of the toothed rim in a frictional manner whenthe pawl is released and operate as a brake to govern the backwardmovement of the drum.

When the hoisting mechanism is operated to lift the weight, the pawl 10as the lever 9 is moved upward and downward is disengaged and engagedwith the toothed rim and the pawl 11 operates to hold the weight whenthe pawl 10 is disengaged in the well-known way. When used in connectionwith a cornshocking machine. the shock is raised, as above stated, andthe lever 9 is operated as a sweep to turn the mast in its supports andswing the shock clear of the machine. If it be desired to drop the shockdirectly upon the ground, the lever 9 is depressed until the pawls 10and 11 are released, and the drum is then left free to turn under thestrain of the cable. If it be desired to allow the shock to graduallyapproach the ground, the lever 9 is depressed until the shoe engages theinner surface of the ratchet-rim frictionally, and by manipulating thelever the operator may then control the movement of the shock asdesired.

What I claim as being my invention, and desire to secure by LettersPatent, is

1. Inahoisting mechanism, the combination of a winding-drum rotatablymounted upon a fixed support, a lever mounted coaxially with said drumand having operative connection therewith to rotate it in one direction,said connection being automatically released when said lever has reacheda predetermined limit, and a brake mechanism operative to preventrotation of said drum, said brake mechanism being actuated by said leverafter it h as passed said predetermined limit.

2. In a hoisting mechanism, the combination of a winding-drum rotatablymounted upon a fixed support, a lever coaxially mounted with said drumand having operative connection therewith to rotate itin one direction,said connection being automatically released when said lever has reacheda predetermined limit, and a brake mechanism operative to preventrotation of said drum comprising a pawl pivotally mounted on said fixedsupport and adapted to positively lock said drum against rotation in anopposite direction, a frictionshoe forming part of said pawl and adaptedto engage with said drum when said pawl is released, said pawl beingreleased by said lever after it has passed said predetermined limit.

3. In a hoisting mechanism, the combination of a winding-drum rotatablymounted upon a fixed support and having a ratchet-wheel connectedtherewith, a lever pivoted upon the axis of the drum, a pawl pivotallymounted on said lever and adapted to engage with said ratchet-wheel whenthe lever is moved in one direction, means for disengaging said pawlwhen the lever has reached a predetermined limit, a pawl pivotallymounted on the fixed support and adapted to engage with theratchet-wheel when the lever is moved in an opposite direction, atoe-piece on said lever adapted to contact with said second-named pawland disengage it when said lever has reached its predetermined limit,and a brakeshoe forming part of said pawl and adapted to be frictionallyengaged with said ratchetlwheel when said lever passes beyond saidinnit.

4:. In ahoisting mechanism, the combination of a winding-d rum rotatablymounted upon a fixed support and having a ratchet-wheel forming a partthereof, a lever pivoted upon the axis of the drum, a pawl pivotallymounted on said lever and adapted to engage with said ratchet-wheel whenthe lever is moved in one direction, means for disengaging said pawlwhen the lever has reached a predetermined limit comprising an ear onthe fixed support shoe forming part of said pawl and adapted to befrictionally engaged with said ratchetwheel when said lever passesbeyond said limit.

5. In ahoisting mechanism, the combination of a winding-drum rotatablymounted upon a fixed support and havinga ratchet-wheel forming a partthereof, a lever pivoted upon the axis of the drum, a pawl pivotallymounted on said lever and adapted to engage with said ratchet-wheel whenthe lever is moved in one direction, means for disengaging said pawlwhen the lever has reached a predetermined limit, a pawl pivotallymonnted'on the fixed support and adapted to engage with theratchet-wheel when the lever is moved in an opposite direction, atoe-piece on said lever adapted to contact with said second-named pawland disengage it when said lever has reached its predetermined limit,and a brakeshoe forming part of said pawl and adapted to frictionallyengage with the inner surface of the rim of said ratchet-wheel when saidlever passes beyond said limit.

In witness whereof 1 hereto affix my signature in presence of twowitnesses.

DANIEL W. SMITH.

' Witnesses:

A. M. CHRISTIAN, G. W. HENDERSON.

